Foldout has RegisterValueChangedCallback triggered when child foldout is toggled

Unity Engine
,
1

Simple code:

Foldout expand = ui.Q<Foldout>("FoldoutExpander");
                expand.RegisterValueChangedCallback(evt =>
                {
}

The above triggers even when a foldout that is a child of FoldoutExpander changes (yes they have different names).

2

I had the same issue, I fixed this by adding the callback to the Toggle inside the foldout, like this:

var toggle = expand.Q<Toggle>();
expand.RegisterValueChangedCallback(evt => {});
1 Like
3

ChangeEvent bubble up, in order to make sure the event was triggered by your foldout and not a child, you can check if evt.target is your foldout:

expand.RegisterValueChangedCallback(evt =>
{
   if(evt.target == expand) 
  {           
    // ....
  }
}
1 Like